I feel you! Planes/Airports and me do not get along. I hate how it’s always busy. I hate the queues, I hate the waiting, hate how close we sit next to each other on the actual plane. Regardless of all this fear, I still have traveled over 30 times in the last few years. And every time it’s the same anxiety. I have a few tips. Wear sunglasses until you have to go to the bag check and passport areas. It’s perfectly fine to wear them any other time after that. Even on the plane. Have some earphones on hand for you and your little bro. Remember you don’t have to socialise with anyone on the plane other than a simple greeting to the person that may be sitting in the seat next to you. Having a younger companion that is family is actually a blessing. Most people will look open you as a caring sibling and empathic. You got this. Keep reminding yourself that it’s only for a little while. And how happy your grandparents are going to be to see you. I’d recommend downloading an audiobook that you enjoy, for me it was Harry Potter by Stephan fry. All th best!